Using discrete available$-$to$-$promise $($ATP$)$ logic, calculate the master production schedule $($MPS$)$ for the following conditions.

$\backslash$table$[[,,$Period$],[,$On hand,$1,2,3,4,5,],[$Forecast$,,20,18,25,15,12,],[$Orders$,,6,4,8,0,3,],[$Projected available balance,$15,,,,,,],[$Available$-$to$-$promise $($discrete$),,,,,,,],[$Master production schedule,,,,,,,$],[$Lot size $=25,$ Safety stock $=10,]]$

How many units are available$-$to$-$promise $($discrete$)$ in period $3?$

$13$

$17$

$20$

$25$